Here is a peice done by Julia Trigg. I love her work. "The rich vintage colours and abstract compositions work particularly well in contemporary interiors" Follow this link to look at her website.
This Designers colourful typography can be found in London, Stockholm, and Paris. I admire this work. You could class it as graffiti but at the end of the day its not. Its street typography. Thats something you could argue with. Graffiti being typography.
Pedro Oliveira
Visit this website to view an interview http://www.notpaper.net/2009/04/pedro-oliveira.html 